Meerdere Galeocerdo\'s in Mill??
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Supergraver
- Berichten: 4017
- Lid geworden op: 25 feb 2005, 16:14
Antw: Meerdere Galeocerdo\'s in Mill??
Maar waar ik eigenlijk een beetje op gehoopt had was dat er iemand met \'bewijzen\' zou komen voor een of meerdere soorten Galeocerdo naast de reeds bekende G. aduncus in Mill.
Gr
Martijn
Gr
Martijn
Antw: Meerdere Galeocerdo\'s in Mill??
Even ter info wat Compagno schrijft over Galeocerdo cuvier:
COMPAGNO 1984 (FAQ Species Catalogue)
…
Habitat and Biology : A common, wide-ranging coastal-pelagic tropical and warm-temperate shark, with a wide tolerance for different marine habitats, on or adjacent to the continental and insular shelves at depths from the surface and intertidal to possibly 140 m. It seems to prefer turbid areas in continental waters, large island groups or high volcanic islands where high runoff of fresh water may contribute to a high density of prey organisms. It often occurs in river estuaries, close inshore off wharves and jetties in harbours, and in coral atolls
and lagoons. It is also known to make excursions far offshore, in the open ocean, but is not a truely oceanic species like Prionace and certain Carcharhinus. It does occur off oceanic islands far from other islands and continental land masses, and probably is capable of long oceanic voyages between islands.
The tiger shark is apparently nocturnal, and shows a localized diel cycle of movement inshore at night into shallow bays, estuaries, passes between islands, lagoons, and other shallow areas sometimes barely deep enough to swim in. By day the sharks retreat to deeper water off reefs and in deeper areas of bays and lagoons where they remain until nightfall. During the day, smaller tiger sharks may be more active, less timid in light, and less reluctant to approach the surface than large ones, though all sizes come to the surface at night. Although tiger
sharks may form aggregations, especially when feeding, the species may be more often solitary.
Adults and subadult tiger sharks may be resident or semi-resident around oceanic islands, with movement by some individuals into or out of the area. With depletion of a resident population around such islands, smaller individuals will gradually recolonize them, probably by swimming across the open ocean. Seasonal movements have been noted for continental waters.
The tiger shark is an active, strong-swimming shark, ordinarily seen cruising slowly with a sinuous motion that has been described as \'sluggish\'. When attacking or fleeing it becomes highly active, and is capable of bursts of high-speed swimming. It can be kept in aquaria, but usually does not last more than a few months.
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[Bewerkt door Somniosus op 16-11-2007 om 13:57 NL]
COMPAGNO 1984 (FAQ Species Catalogue)
…
Habitat and Biology : A common, wide-ranging coastal-pelagic tropical and warm-temperate shark, with a wide tolerance for different marine habitats, on or adjacent to the continental and insular shelves at depths from the surface and intertidal to possibly 140 m. It seems to prefer turbid areas in continental waters, large island groups or high volcanic islands where high runoff of fresh water may contribute to a high density of prey organisms. It often occurs in river estuaries, close inshore off wharves and jetties in harbours, and in coral atolls
and lagoons. It is also known to make excursions far offshore, in the open ocean, but is not a truely oceanic species like Prionace and certain Carcharhinus. It does occur off oceanic islands far from other islands and continental land masses, and probably is capable of long oceanic voyages between islands.
The tiger shark is apparently nocturnal, and shows a localized diel cycle of movement inshore at night into shallow bays, estuaries, passes between islands, lagoons, and other shallow areas sometimes barely deep enough to swim in. By day the sharks retreat to deeper water off reefs and in deeper areas of bays and lagoons where they remain until nightfall. During the day, smaller tiger sharks may be more active, less timid in light, and less reluctant to approach the surface than large ones, though all sizes come to the surface at night. Although tiger
sharks may form aggregations, especially when feeding, the species may be more often solitary.
Adults and subadult tiger sharks may be resident or semi-resident around oceanic islands, with movement by some individuals into or out of the area. With depletion of a resident population around such islands, smaller individuals will gradually recolonize them, probably by swimming across the open ocean. Seasonal movements have been noted for continental waters.
The tiger shark is an active, strong-swimming shark, ordinarily seen cruising slowly with a sinuous motion that has been described as \'sluggish\'. When attacking or fleeing it becomes highly active, and is capable of bursts of high-speed swimming. It can be kept in aquaria, but usually does not last more than a few months.
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[Bewerkt door Somniosus op 16-11-2007 om 13:57 NL]